4. Main instrumental techniques
The spectro-imager collects the incident photons, finely disperses them according to wavelength, and records them in a detector. Several techniques exist, classified into five main families. The first four families described below are based on dispersive techniques, while the last is based on interferometry.
4.1 Continuously variable filter spectrometer
This is the simplest system. It consists of a bandpass filter whose coating thickness varies along an axis of the detector, inducing a variation in spectral transmission along this axis (figure 12 a ). The number of spectral bands depends on the number of detector lines. In the perpendicular...
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Main instrumental techniques
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